Sheet-metal-hoop-forming machine.



E. W. ROBINSON.

SHEET METAL HOOP FORMING MACHINE.

APPLICATION FILED JAN. 1. 1915.

wmw, Patented Oct. 26, 1915.

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INVEN'IOR W 07M E AR ROBWSON I y 11 5 f'FoRQE COLUMBIA PLANOCIRAPH co., WASHINGTON, n. c.

E.- W. ROBINSON.

SHEET METAL HOOP FORMING MACHINE. APPLICATION FILED JAN-7.1915.

1,1529%. Patented Oct. 26,1915.

3 SHEETS-SHEET 2- E. W. ROBINSON.

SHEET METAL HOOP FORMING MACHINE. APPLICATION FILED JAN- 7. I915.

1,158,29%. Patented Oct. 26, 1915.

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EDWARD W. ROBINSON, OF SAVANNAH, GEORGIA, ASSIGNOR '10 INTERNATIONAL BARREL COMPANY, OF SAVANNAH, GEORGIA, A CORPORATION OF GEORGIA.

SHEET-METAL-HOOTB-FORMING- MACHINE.

Specification of Letters Patent.

Patented @ct. 26, 1915.

Application filed January 7, 1915. Serial No. 946.

To all whom it may concern Be it known that I, EDWARD W. ROBIN- soN, a citizen of the United States, residing same with some of the parts removed; Fig.

3 is a top view in diagrammatic form illustrating the compression rolls and the bearing and guide rollers of the machine and their relation to one another; Fig. 4 is an enlarged transverse section on the line aa, Fig. 2; Fig. 5 is a perspective view of the strip from which the hoop blank is to be produced, showing the same in the conditionin which it entersthe machine; Fig. 6 is a perspective view of the hoop blank after it issues from the machine, and Fig. 7 is a diagrammatic view, on a larger scale than the other figures, illustrating one of the features of the machine.

The sheet metal striu shown in Fig. 5 has two flanges 1 and 2 in parallel planes, and a connecting web 3 at right angles thereto,

and in forming this straight strip. into the hoop blank shown in Fig. 6, the flange 1 is expanded longitudinally at and near its free edge so as to cause said flange to bend edgewise, this operation also causing the web 3 to bend flatwise and the flange 2 to bend edgewise, the free edge of said flange 2 being thereby contracted in length so as to cause wrinkling of said flange, as shown in Fig. 6..

The machine which I have devised for producing this hoop blank from the straight strip has a pair. of press rolls 44, a bearing roller 5, and guide rollers 6 and 7, disposed as shown in Figs. 1, 2 and 3. As shown in Fig. 7 the press rolls 4-4 are so shaped or set as to impart to the flange 1 pressure which gradually increases from that P tion o t e a i nt to t e web 3 to the free edge of the flange so as to cause longitudinal expansion of said flange at and near its free edge, such longitudinal expansion having the effect of bending edgewise the flanges 1 and 2 and bending flatwise the connecting web 3.

The axes of the rolls 4 are at right angles to the axes of the rollers 5, 6 and 7, and are preferably horizontal, those of the rollers 5, 6 and 7 being vertical, as shown in Figs. 1 and 2. The axis of the roller 5 is in line vertically with the axes of the rolls 4 and the periphery of said roller 5 bears upon the outer face of the web 3 of the strip at the bite of the rolls 4 and thereby prevents any distortion or displacement of said webs 3 at the point where the pressure is being imparted to the flange 1.

The peripheries of the rollers 6 and 7 bear against the inner face of the web 3 and extend up to the angle between said web and the flange 1, as shown in Fig. 4, so as to properly guide the strip in its movement to and from the rolls 4. The roller 6 engages the strip on its way to the rolls 4, and the roller 7 engages the strip as it issues from said rolls, and said roller 7 occupies a position a little farther outward than the roller 6 so as to accommodate the curve imparted to the strip by the action of the rolls 4, as shown in Fig. 3. The roller 7 is adjustable laterally to a limited extent so as to compensate for different degrees of curvature which may be imparted to the strip.

The roller 5 is mounted upon a bed 8 cutwardly beyond the rolls 4, as shown in Fig. 1, and the rollers 6 and 7 are mounted be tween upper and lower projecting jaws 9 on plates 6 and 7 both of these plates, or at least the plate 7, being mounted so as to be laterally ad1ustable on the front housings 10 which guide the forward boxes for the shafts of the rolls 4, the rear boxes for said shafts being carried by a rear housing 11, as shoWIlin Fig. 1.

Any available means may be employed for rotating the shafts of the rolls 4, this constituting no essential part of my invention. In the present instance, however, 1 have shown a driving shaft 12 having a belt receiving pulley 13 and provided with a spur inion 14 which meshes with a spur wheel. 15 on the shaft of theupper roll 4, said shaft being geared to the shaft of the lower roll 4 by means of a pair of inter- IIneshing spur wheels 16 and 17, as shown in 'Ihe upper jaw 9 of each of the plates 6 and 7 serves as a guide bar for that flange of the strip which is being acted upon by the rolls 4, said flange passing between the under face of said guide bar and the upper face of the roller, and said guide bar extending toward the upper roll 4 and being tapered at its inner end so as to extend as closely as possible to the bite of the-rolls,

' as shown in Fig. 2.

It will be evident that the machine can be used with equally good effect in pr oducing a hoop blank from a strip which 1s not provided with the flange 2.

I claim:

,1. In a machine for producing a hoop blank from a straight strip of angular cross section, the combination of a pair of press rolls acting upon one of. the flanges of the strip and approaching one another more closely at the free edge of the flange than at the other portion of the same, and a bearing roller contacting with that member of the strip which is at an angle to the flange first mentioned.

2. In a machine for producing a hoop blank from a straight strip of angular cross section, the combination of a pair of press rolls acting upon one of the flanges of the strip and approaching one another more closely at the free edge of said flange than at the other portion of the same, and a guide and support roller located in advance of the press rolls and occupying the angle between the flange first mentioned and the member of the strip which is at an angle thereto.

3. In a machine for producing a hoop blank from a straight strip of angular cross section, the combination of a pair of press rolls acting upon one of the flanges of the strip and approaching one another more closely atwthefree edge of said flange than at the other portion of the same, and a guideand support roller located in the rear of the press rolls and occupying the angle between the flange first mentioned and the member of the strip which is at an angle thereto.

4. In a machine for producing a hoop blank from a straight strip of angular cross section, the combination of a pair of press rolls acting upon one of the flanges of the strip and approaching one another more closely at the free edge of said flange than at the other portion of the same, and a guide and support roller located in the rear of the press rolls and occupying the angle between the flange first mentioned and the member of the strip which is at an angle thereto, said roller being adjustable laterally to compensate for difference in the degree of curvature imparted to the strip.

strip and approaching one another more r closely at the free edge of said flange than at the other portion of the same, and guide and support rollers one located in advance of the press rolls and the other in the rear of the same, said rollers occupying the angle between the flange first mentioned and the member which is at an angle thereto.

6. In a machine for producing a hoop blank from a straight strip of angular cross section, the combination of a pair of press rolls acting upon one of the flanges of the strip and approaching one another more closely at the free edge of said flange than at the other portion of the same, a roller for bearing upon the outer face of the member which is at an angle to the flange first mentioned, and a guide roller occupying the angle between said flange and said angular member, the bearing roller occupying a position adjacent to the bite of the press rolls, and the guide roller acting upon the strip as it approaches or leaves the press rolls.

7. In a machine for producing a hoop blank from a straight strip of angular cross section, the combination of a pair of press rolls acting upon one of the flanges of the strip and approaching one another more closely at the free edge of said flange than at the other portion of the same, a guide roller occupying the angle between the flange first mentioned and the member at an angle thereto, and a guide bar so located above said roller that the flange first mentioned can pass between it and the upper face of the roller.

8. In a machine for producing a hoop blank from a straight strip of angular cross section, the combination of a pair of press rolls acting upon one of the flanges of the strip and approaching one another more closely at the free edge of said flange than at the other portion of the same, a guide roller occupying the angle between said flange and the member at an angle thereto, and a guide bar so located above said roller that the flange can pass between it and the upper face of the roller. said guide bar having a tapered end adjacent to the upper press roll, whereby it serves to guide said flange as closely as possible to the bite of the rolls.

9. In a machine for producing a hoop blank from a straight strip of angular cross 'section, the combination of a pair of press rolls acting upon one of the flanges of the strip and approaching one another more which is at an angle to the flange first mentloned, and a pair of guide rollers one in adname to this specification, in the presence of "ance and one1 1in the rear of the presslrolls, tWo subscribing Witnesses. said guide r0 ers occupying the ange between the flange Which is being acted upon EDWARD ROBINSON by the press rolls and the member Which is Witnesses: at an angle thereto. KATE A. BEADLE,

In testimony whereof, I have signed my HAMILTON D. TURNER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

